I accidentally managed to acquire both versions of this lens, and I've seen talk about differences, so here's a quick comparison:
Early Lens:
-Metal Barrel
-Made in Taiwan
-49 teeth on the aperture ring
-165g
Late Lens:
-Plastic Barrel (just like the 'A' counterpart, except it's made in Japan)
-Made in Japan
-59 teeth on the aperture ring
-138g
It also looks like there are some differences in the diaphragm- specifically in how the stop-down lever works and how the blades are positioned.
See the comparison photos below for a visual reference:
Adam
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